| (19) |
 |
|
(11) |
EP 0 429 312 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.02.1992 Bulletin 1992/08 |
| (43) |
Date of publication A2: |
|
29.05.1991 Bulletin 1991/22 |
| (22) |
Date of filing: 23.11.1990 |
|
| (51) |
International Patent Classification (IPC)5: B29C 67/14 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
24.11.1989 JP 306211/89
|
| (71) |
Applicant: Tonen Corporation |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Takezawa, Makoto
Chiyoda-ku,
Tokyo (JP)
- Miyao, Makiji
Chiyoda-ku,
Tokyo (JP)
- Murakami, Shinkichi
Chiyoda-ku,
Tokyo (JP)
- Atsumi, Akihiro
Chiyoda-ku,
Tokyo (JP)
|
| (74) |
Representative: Harvey, David Gareth et al |
|
Graham Watt & Co.
Riverhead
Sevenoaks
Kent TN13 2BN
Sevenoaks
Kent TN13 2BN (GB) |
|
| |
|
| (54) |
Unidirectional thin glass prepreg |
(57) A glass prepreg is made by forming a roving by a single operation of converging monofilaments
of glass fiber into a strand or roving the monofilaments of which are arranged in
an orderly manner without being twisted or doubled, disposing such rovings unidirectionally
on a thin resin-coated base sheet, or sandwiching them unidirectionally between two
such base sheets; and causing the resin coating fully and homogeneously to permeate
the monofilaments of the rovings.
The monofilaments employed have diameters in the range of 10 to 20 µm and the prepreg
has a thickness in the range of 50 to 150 µm